“Marine littering”, i.e. the pollution of the world’s oceans, rivers and lakes, endangers the organisms living in them and is one of the greatest challenges for our global society. An estimated 150 million tonnes of plastic are already in our oceans, and more than 10 million tonnes are added each year. Up to 80 percent of marine litter originates on land, about three-quarters of which are made of plastic. If pollution continues at the current rate, the seas will be completely littered in a few years. According to recent UN studies, by 2050, more plastic parts than fish are expected to swim in our seas. Huge carpets of plastic waste are already forming on the world’s oceans, the largest of which, the Great Pacific Garbage Patch in the Pacific, already has the size of Central Europe, i.e. Germany, Austria, Switzerland, Poland, Luxembourg, Hungary and the Czech Republic. Birds, fish and other creatures eat plastic parts and die from their stomachs clogged with garbage or from internal injuries. For more than 40 percent of whales, about 36 percent of seabirds and almost all species of fish and sea turtles, it is scientifically documented that they eat garbage. Other marine animals get tangled up or strangle in old fishing nets, ropes or plastic foils.